Heat pump system capable of preventing frosting of outdoor heat exchanger and control method thereof

Abstract

The invention relates to a heat pump system capable of preventing frosting of an outdoor heat exchanger and a control method thereof, include a compressor, Four-way valve, indoor heat exchanger, a refrigerant circulation pipeline composed of an outdoor heat exchanger and a gas-liquid separator, the outdoor heat exchanger comprises a first row, a second row and a third row of heat exchange tubes, wherein the inlet end of the first row of heat exchange tubes is connected with the four-way valve E port through a third solenoid valve, and the outlet end thereof is respectively connected with the four-way valve C port through a second solenoid valve and the inlet end of the outdoor electronic expansion valve through a third electronic expansion valve; The inlet ends of the second and third rowsof heat exchange tubes are respectively connected with the outlet ends of the indoor heat exchanger through an outdoor electronic expansion valve, and the outlet ends of the indoor heat exchanger areconnected with the four-way valve C port; The inlet end of the first row of heat exchange tubes is also connected with the outlet end of the outdoor electronic expansion valve through the first solenoid valve at the same time. A system high-pressure sensor and a system low-pressure sensor are respectively arranged on that E port and the C port of the four-way valve. The invention can effectivelyavoid frosting of the outdoor unit.

Description

technical field [0001] The invention relates to an air conditioner, in particular to a heat pump system, in particular to a heat pump system capable of preventing frosting of an outdoor heat exchanger and a control method thereof. Background technique [0002] When the heat pump system is in heating operation, the outdoor heat exchanger is an evaporator. Since the evaporation temperature of the outdoor heat exchanger is low, when the surface temperature of the heat exchanger is lower than the dew point temperature of water vapor in the outdoor air, the water vapor in the air will condense to the outside. On the surface of the heat exchanger, after long-term operation, water film, frost layer, and finally a large amount of frost will form on the surface of the outdoor heat exchanger. [0003] Frosting on the surface of the heat exchanger is a gradual process, as shown in Figure (1), divided into normal working area, water film forming point, frost layer forming area, thin fro...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of frosting on the outdoor unit of the current heat pump system, and provide a heat pump system and its control method that can prevent the outdoor heat exchanger from frosting, which can effectively prevent the outdoor unit from frosting during the heating operation of the heat pump system, and improve the efficiency of the heat pump system. Improve the operating efficiency of the system and improve the user experience

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